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region (re´jun)

1. An often arbitrarily limited portion of the surface of the body. See also space, zone. 2. A portion of the body having a special nervous or vascular supply, or a part of an organ having a special function. See also area, space, spatium, zone.regio [NA]; [L. regio]
abdominal r.'s the topographical subdivisions of the abdomen; based on subdividing the abdomen by the transpyloric, interspinous and midclavicular planes; including the right and left hypochondriac, right and left lateral, right and left inguinal, and the unpaired epigastric, umbilical and pubic regions.regiones abdominis [NA], abdominal zones;
anal r. anal triangle
ankle r. the region of the lower limb between the leg (crus) and the foot (pes).regio talocruralis [NA];
anterior antebrachial r. anterior r. of forearm
anterior r. of arm area between deltoid region superiorly and anterior region of elbow inferiorly.facies brachialis anterior [NA], regio brachialis anterior [NA], anterior surface of arm, facies anterior brachii;
anterior brachial r. the anterior region of the arm.
anterior carpal r. the anterior part of the wrist.regio carpalis anterior [NA];
anterior crural r. anterior r. of leg
anterior cubital r. anterior r. of elbow
anterior r. of elbow the area in front of the elbow, including the cubital fossa.facies cubitalis anterior [NA], regio cubitalis anterior [NA], anterior cubital r., anterior surface of elbow;
anterior r. of forearm the area between the radial and ulnar borders of the forearm anteriorly.facies antebrachialis anterior [NA], regio antebrachialis anterior [NA], anterior antebrachial r., anterior surface of forearm, facies anterior antebrachii;
anterior hypothalamic r. the rostral portion of the hypothalamus that includes preoptic, supraoptic, paraventricular and anterior hypothalamic nuclei; the hypothalamic structures located internally in the general area of the optic chiasm.
anterior knee r. the anterior region of the knee.regio genus anterior [NA];
anterior r. of leg the anterior surface of the inferior limb between the knee and the ankle.facies cruralis anterior [NA], regio cruralis anterior [NA], anterior crural r., anterior surface of leg, facies anterior cruris;
anterior r. of neck anterior triangle of neck
anterior r. of thigh the front of the thigh, including the femoral triangle.facies femoralis anterior [NA], anterior surface of thigh, regio femoralis anterior;
axillary r. the region of the axilla, including the axillary fossa.regio axillaris [NA];
r.'s of back the topographical regions of the back of the trunk, including the vertebral r., sacral r., scapular r., infrascapular r., and lumbar r.regiones dorsales [NA];
r.'s of body the topographical divisions of the body.regiones corporis [NA];
buccal r. the region of the cheek, corresponding approximately to the outlines of the underlying buccinator muscle.regio buccalis [NA];
calcaneal r. the region of the heel.regio calcanea [NA];
r.'s of chest , r. of chest the topographic divisions of the chest: presternal, mammary, inframammary, and axillary. See pectoral r.regiones pectorales [NA];
chromosomal r. that part of a chromosome defined either by anatomical details, notably banding, or by its linkages (linkage group).
complementarity determining r.'s that part of an antibody or T cell receptor variable r. that binds with antigen or antigen/major histocompatibility molecule.
constant r. See immunoglobulin.
deltoid r. the lateral aspect of the shoulder demarcated by the outlines of the deltoid muscle.regio deltoidea [NA];
dorsal hypothalamic r. the portion of the hypothalamus located immediately ventral to the hypothalamic sulcus; contains small nuclei, some of which are associated with the ansa lenticularis and the entopeduncular nucleus.
epigastric r. the region of the abdomen located between the costal margins and the subcostal plane.epigastrium [NA], regio epigastrica [NA];
r.'s of face the topographical subdivisions of the face, including nasal, oral, mental, orbital, infraorbital, buccal, and zygomatic.regiones faciales [NA];
femoral r. the region of the thigh between hip and knee.regio femoralis [NA];
frontal r. of head the surface region of the head corresponding to the outlines of the frontal bone.regio frontalis capitis [NA];
gluteal r. the region of the buttocks.regio glutealis [NA];
r.'s of head the topographical division of the cranium in relation to the bones of the cranial vault; the regions include frontal, parietal, occipital, and temporal.regiones capitis [NA];
hinge r. 1. that part of a tRNA structure that is deformed, bending a "cloverleaf" (two-dimensional) model to form an "L" model (crystal form, as seen by electron microscopy); 2. in an immunoglobulin, a short sequence of amino acids that lies between two longer sequences and allows the latter to bend about the former.
hypervariable r.'s (hI-per´var-I-a-ble) the r.'s of the immunoglobulin molecule that contain most of the residues involved in the antibody binding site.
hypochondriac r. the region on each side of the abdomen covered by the costal cartilages; it is lateral to the epigastric region.regio hypochondriaca [NA], hypochondrium;
I r. that area of the H-2 complex of mice that contains Class II major histocompatibility complex genes.
iliac r. inguinal r
r.'s of inferior limb r.'s of lower limb
inframammary r. the region of the chest inferior to the mammary gland.regio inframammaria [NA];
infraorbital r. the region of the face below the orbit and alongside the nose on each side.regio infraorbitalis [NA];
infrascapular r. the region of the back lateral to the vertebral region and below the scapula.regio infrascapularis [NA];
inguinal r. the topographical area of the inferior abdomen related to the inguinal canal, lateral to the pubic region.regio inguinalis [NA], groin (1), iliac r., inguen;
r. of interest in computed tomography or other computerized imaging, an interactively selected portion of the image, whose individual or average pixel values can be displayed numerically.
intermediate hypothalamic r. the infundibular portion of the hypothalamus, includes the medial tuberal nuclei and portions of the dorsomedial, ventromedial, arcuate (infundibular), posterior and lateral hypothalamic nuclei; located internally in the general area of the infundibulum.
K r. carbons 9 and 10 of the phenanthrene ring system; thought by some to be the reactive spot in the various hydrocarbon carcinogens.
lateral r. the area of the abdomen on each side of the umbilical region between transpyloric plane and intertubercular or interspinous plane.regio lateralis [NA];
lateral hypothalamic r. extends throughout most of the rostrocaudal extent of the hypothalamus lateral to the column of the fornix; includes lateral tuberal nuclei, tuberomamillary nuclei, and diffuse populations of cells.lateral hypothalamic area;
lateral r. of neck posterior triangle of neck
r.'s of lower limb the topographic divisions of the lower limb: gluteal, thigh (or femoral), knee, leg (or crural), ankle, and foot.regiones membri inferioris [NA], r.'s of inferior limb;
lumbar r. the region of the back lateral to the vertebral region and between the rib cage and the pelvis.regio lumbalis [NA];
mammary r. the region of the breast.regio mammaria [NA];
mental r. the region of the chin.regio mentalis [NA];
nasal r. the region of the nose.regio nasalis [NA];
r.'s of neck the topographical subdivisions of the neck.regiones cervicales [NA], neck (1);
nuchal region posterior r. of neck
nucleolus organizer r. an arrangement of the DNA coding for the production of ribosomal RNA (rRNA).
occipital r. of head the surface region of the head corresponding to the outlines of the occipital bone.regio occipitalis capitis [NA];
r. of olfactory mucosa the specialized olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha; it is lined with olfactory mucosa.regio olfactoria tunicae mucosae nasi [NA], olfactory r. of tunica mucosa of nose, Schultze's membrane;
olfactory r. of tunica mucosa of nose r. of olfactory mucosa
oral r. the region of the face including the lips and mouth.regio oralis [NA];
orbital r. the region about the orbit.regio orbitalis [NA];
parietal r. the surface region of the head corresponding to the outlines of the underlying parietal bone.regio parietalis capitis [NA];
pectoral r. , pectoral r.'s the region of the chest demarcated by the outline of the pectoralis major muscle. See pectoral r., r.'s of chest.regio pectoralis [NA];
perineal r. the r. at the lower end of the trunk, anterior to the sacral region and posterior to the pubic region between the thighs; it is divided into the anal triangle posteriorly and the urogenital triangle anteriorly.regio perinealis [NA];
popliteal r. popliteal fossa
posterior antebrachial r. posterior r. of forearm
posterior r. of arm the back of arm.facies brachialis posterior [NA], regio brachialis posterior [NA], posterior brachial r., posterior surface of arm;
posterior brachial r. posterior r. of arm
posterior carpal r. the posterior part of the wrist.regio carpalis posterior [NA];
posterior crural r. posterior r. of leg
posterior cubital r. posterior r. of elbow
posterior r. of elbow the back of the elbow.facies cubitalis posterior [NA], regio cubitalis posterior [NA], posterior cubital r., posterior surface of elbow;
posterior r. of forearm the area between the radial and ulnar borders of the forearm posteriorly.regio antebrachialis posterior [NA], facies antebrachialis posterior [NA], posterior antebrachial r., posterior surface of forearm;
posterior hypothalamic r. caudal portions of the hypothalamus located internally in the area of the mamillary body, includes medial, intermediate, and lateral mamillary nuclei and the posterior hypothalamic nuclei.posterior hypothalamic area;
posterior knee r. the posterior region of the knee, including the popliteal fossa.regio genus posterior [NA];
posterior r. of leg the back of the leg.regio cruralis posterior [NA], posterior crural r., posterior surface of leg;
posterior r. of neck the back of neck, including the suboccipital region.regio nuchalis [NA], nuchal region, posterior neck r., regio cervicalis posterior;
posterior neck r. posterior r. of neck
posterior r. of thigh the back of the thigh.facies femoralis posterior [NA], posterior surface of thigh, regio femoralis posterior;
preoptic r. the most anterior part of the hypothalamus surrounding the anterior or preoptic part of the third ventricle and including the lamina terminalis; containing the lateral and medial preoptic nucleus continuous caudally with, respectively, the lateral and anterior hypothalamic nucleus; rostrally the preoptic r. is continuous with the precommissural septum, laterally with the innominate substance.preoptic area;
presternal r. the part of the chest over the sternum.regio presternalis [NA];
presumptive r. in experimental embryology, an area of the blastula from which a specific tissue or organ may be expected to develop.
pretectal r. pretectal area
pubic r. the lower central region of the abdomen below the umbilical region.hypogastrium [NA], regio pubica [NA];
r. of respiratory mucosa the area commencing at the vestibule of the nose lined with respiratory mucosa; with the exception of the olfactory mucusa, it includes the entire nasal cavity.regio respiratoria tunicae mucosae nasi [NA], respiratory r. of tunica mucosa of nose;
respiratory r. of tunica mucosa of nose r. of respiratory mucosa
sacral r. the area of the back overlying the sacrum.regio sacralis [NA];
scaffold-associated r.'s (SAR) sites in DNA that bind topoisomerase II and other scaffold proteins; found in introns.
scapular r. the area of the back corresponding to the outlines of the scapula.regio scapularis [NA];
sternocleidomastoid r. the region overlying the sternocleidomastoid muscle, including the lesser supraclavicular fossa.regio sternocleidomastoidea [NA];
suboccipital r. upper back of neck, inferior to occipital region of head and above the level of the second cervical vertebra; overlies (or includes, deeply) the suboccipital triangle.
r.'s of superior limb r.'s of upper limb
sural r. the muscular swelling of the back of the leg below the knee, formed chiefly by the bellies of the gastrocnemius and soleus muscles.regio suralis [NA], sura [NA], calf (1);
temporal r. of head the surface region of the head corresponding approximately to the outlines of the temporal bone.regio temporalis capitis [NA];
umbilical r. the central region of the abdomen about the umbilicus.regio umbilicalis [NA];
r.'s of upper limb the topographic divisions of the upper limb: deltoid, arm, elbow, forearm, carpal region, and hand.regiones membri superioris [NA], r.'s of superior limb;
urogenital r. urogenital triangle
variable r. See immunoglobulin.
vertebral r. the central region of the back, corresponding to the underlying vertebral column.regio vertebralis [NA];
Wernicke's r. Wernicke's center
zygomatic r. the region of the face outlined by the zygomatic bone; the prominence above the cheek.regio zygomatica [NA];


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